package com.yixun.util;

import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import java.util.StringTokenizer;

/**
 * 随机码工具
 */
public class RandomStrg {

    private String randomstr;

    private boolean allchars = false;

    // 欠缺是8位字符串
    private Integer length = new Integer(8);

    private HashMap<String,String> hmap;

    private ArrayList<Character> lower = null;

    private ArrayList<Character> upper = null;

    private char[] single = null;

    private int singlecount = 0;

    private boolean singles = false;

    private String algorithm = null;

    private String provider = null;

    private boolean secure = false;

    private Random random = null;

    private SecureRandom secrandom = null;

    private final float getFloat() {
        if (random == null) {
            return secrandom.nextFloat();
        } else {
            return random.nextFloat();
        }
    }

    /**
     * generate the Random object that will be used for this random number
     * generator
     *
     */
    public final void generateRandomObject() throws Exception {
        // check to see if the object is a SecureRandom object
        if (secure) {
            try {
                // get an instance of a SecureRandom object
                if (provider != null)
                    // search for algorithm in package provider
                    random = SecureRandom.getInstance(algorithm, provider);
                else
                    random = SecureRandom.getInstance(algorithm);
            } catch (NoSuchAlgorithmException ne) {
                throw new Exception(ne.getMessage());
            } catch (NoSuchProviderException pe) {
                throw new Exception(pe.getMessage());
            }
        } else {
            random = new Random();
        }
    }

    /**
     * generate the random string
     */
    private final void generaterandom() {
        if (allchars)
            for (int i = 0; i < length.intValue(); i++)
                randomstr = randomstr
                        + new Character(
                        (char) ((int) 34 + ((int) (getFloat() * 93))))
                        .toString();
        else if (singles) {
            // check if there are single chars to be included
            if (upper.size() == 3) {
                // check for the number of ranges max 3 uppercase lowercase
                // digits
                // build the random string
                for (int i = 0; i < length.intValue(); i++) {
                    // you have four groups to choose a random number from, to
                    // make
                    // the choice a little more random select a number out of
                    // 100
                    // get a random number even or odd
                    if (((int) (getFloat() * 100)) % 2 == 0) {
                        // the number was even get another number even or odd
                        if (((int) (getFloat() * 100)) % 2 == 0)
                            // choose a random char from the single char group
                            randomstr = randomstr + randomSingle().toString();
                        else
                            // get a random char from the first range
                            randomstr = randomstr
                                    + randomChar((Character) lower.get(2),
                                    (Character) upper.get(2))
                                    .toString();
                    } else {
                        // the number was odd
                        if (((int) (getFloat() * 100)) % 2 == 0)
                            // choose a random char from the second range
                            randomstr = randomstr
                                    + randomChar((Character) lower.get(1),
                                    (Character) upper.get(1))
                                    .toString();
                        else
                            // choose a random char from the third range
                            randomstr = randomstr
                                    + randomChar((Character) lower.get(0),
                                    (Character) upper.get(0))
                                    .toString();
                    }
                }
            } else if (upper.size() == 2) {
                // single chars are to be included choose a random char from
                // two different ranges
                // build the random char from single chars and two ranges
                for (int i = 0; i < length.intValue(); i++) {
                    // select the single chars or a range to get each random
                    // char
                    // from
                    if (((int) (getFloat() * 100)) % 2 == 0) {
                        // get random char from the single chars
                        randomstr = randomstr + randomSingle().toString();
                    } else if (((int) (getFloat() * 100)) % 2 == 0) {
                        // get the random char from the first range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(1),
                                (Character) upper.get(1)).toString();
                    } else {
                        // get the random char from the second range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(0),
                                (Character) upper.get(0)).toString();
                    }
                }
            } else if (upper.size() == 1) {
                // build the random string from single chars and one range
                for (int i = 0; i < length.intValue(); i++) {
                    if (((int) getFloat() * 100) % 2 == 0)
                        // get a random single char
                        randomstr = randomstr + randomSingle().toString();
                    else
                        // get a random char from the range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(0),
                                (Character) upper.get(0)).toString();
                }
            } else {
                // build the rand string from single chars
                for (int i = 0; i < length.intValue(); i++)
                    randomstr = randomstr + randomSingle().toString();
            }
        } else {
            // no single chars are to be included in the random string
            if (upper.size() == 3) {
                // build random strng from three ranges
                for (int i = 0; i < length.intValue(); i++) {
                    if (((int) (getFloat() * 100)) % 2 == 0) {
                        // get random char from first range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(2),
                                (Character) upper.get(2)).toString();
                    } else if (((int) (getFloat() * 100)) % 2 == 0) {
                        // get random char form second range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(1),
                                (Character) upper.get(1)).toString();
                    } else {
                        // get random char from third range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(0),
                                (Character) upper.get(0)).toString();
                    }
                }
            } else if (upper.size() == 2) {
                // build random string from two ranges
                for (int i = 0; i < length.intValue(); i++) {
                    if (((int) (getFloat() * 100)) % 2 == 0)
                        // get random char from first range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(1),
                                (Character) upper.get(1)).toString();
                    else
                        // get random char from second range
                        randomstr = randomstr
                                + randomChar((Character) lower.get(0),
                                (Character) upper.get(0)).toString();
                }
            } else
                // build random string
                for (int i = 0; i < length.intValue(); i++)
                    // get random char from only range
                    randomstr = randomstr
                            + randomChar((Character) lower.get(0),
                            (Character) upper.get(0)).toString();
        }
    }
    /**
     * generate a random char from the single char list
     *
     * @returns - a randomly selscted character from the single char list
     *
     */
    private final Character randomSingle() {
        return (new Character(single[(int) ((getFloat() * singlecount) - 1)]));
    }
    /**
     * generate a random character
     *
     * @param lower
     *            lower bound from which to get a random char
     * @param upper
     *            upper bound from which to get a random char
     *
     * @returns - a randomly generated character
     *
     */
    private final Character randomChar(Character lower, Character upper) {
        int tempval;
        char low = lower.charValue();
        char up = upper.charValue();
        // get a random number in the range lowlow - lowup
        tempval = (int) ((int) low + (getFloat() * ((int) (up - low))));
        // return the random char
        return (new Character((char) tempval));
    }

    /**
     * 获取随机码
     * @return String 随机码
     * */
    public final String getRandom() {
        randomstr = new String();
        generaterandom(); // generate the first random string
        if (hmap != null) {
            while (hmap.containsKey(randomstr)) {
                // random string has already been created generate a different
                // one
                generaterandom();
            }
            hmap.put(randomstr, null); // add the new random string
        }
        return randomstr;
    }

    /**
     * set the ranges from which to choose the characters for the random string
     *
     * @param low
     *            set of lower ranges
     * @param up
     *            set of upper ranges
     *
     */
    public final void setRanges(ArrayList<Character> low, ArrayList<Character> up) {
        lower = low;
        upper = up;
    }

    /**
     * set the hashmap that is used to check the uniqueness of random strings
     *
     * @param map
     *            hashmap whose keys are used to insure uniqueness of random
     *            strgs
     *
     */
    public final void setHmap(HashMap<String,String> map) {
        hmap = map;
    }

    /**
     * set the length of the random string
     *
     * @param value
     *            length of the random string
     *
     */
    public final void setLength(String value) {
        length = new Integer(value);
    }

    /**
     * set the algorithm name
     *
     * @param value
     *            name of the algorithm to use for a SecureRandom object
     *
     */
    public final void setAlgorithm(String value) {
        algorithm = value;
        secure = true; // a SecureRandom object is to be used
    }

   /**
     * set the provider name
     *
     * @param value
     *            name of the package to check for the algorithm
     *
     */
    public final void setProvider(String value) {
        provider = value;
    }

    /**
     * set the allchars flag
     *
     * @param value
     *            boolean value of the allchars flag
     *
     */
    public final void setAllchars(boolean value) {
        allchars = value;
    }

    /**
     * set the array of single chars to choose from for this random string and
     * the number of chars in the array
     *
     * @param chars
     *            the array of single chars
     * @param value
     *            the number of single chars
     *
     */
    public final void setSingle(char[] chars, int value) {
        single = chars; // set the array of chars
        singlecount = value; // set the number of chars in array single
        singles = true; // set flag that single chars are in use
    }

    public final void setCharset(String value) {
        // values tells the method whether or not to check for single chars
        boolean more = true;
        // create the arraylists to hold the upper and lower bounds for the char
        // ranges
        lower = new ArrayList<Character>(3);
        upper = new ArrayList<Character>(3);
        // user has chosen to use all possible characters in the random string
        if (value.compareTo("all") == 0) {
            allchars = true; // set allchars flag
            // all chars are to be used so there are no single chars to sort
            // through
            more = false;
        } else if ((value.charAt(1) == '-') && (value.charAt(0) != '\\')) {
            // run through the ranges at most 3
            while (more && (value.charAt(1) == '-')) {
                // check to make sure that the dash is not the single char
                if (value.charAt(0) == '\\')
                    break;
                else {
                    // add upper and lower ranges to there list
                    lower.add(new Character(value.charAt(0)));
                    upper.add(new Character(value.charAt(2)));
                }
                // check to see if there is more to the charset
                if (value.length() <= 3)
                    more = false;
                else
                    // create a new string so that the next range if there is
                    // one
                    // starts it
                    value = value.substring(3);
            }
        }
        // if more = false there are no single chars in the charset
        if (more) {
            single = new char[30]; // create single
            // create a set of tokens from the string of single chars
            StringTokenizer tokens = new StringTokenizer(value);
            while (tokens.hasMoreTokens()) {
                // get the next token from the string
                String token = tokens.nextToken();
                if (token.length() > 1)
                    // char is a - add it to the list
                    single[singlecount++] = '-';
                // add the current char to the list
                single[singlecount++] = token.charAt(0);
            }
        }
        if ((lower == null) && (single == null))
            setCharset("a-zA-Z0-9");
    }

   /**
     * 获取随机位数
     * @param charset 字符范围，为空的话，默认为A-Z0-9
     * @paramString strLength 字符长度，为空的话默认为4
     * @return boolean
     */
    public static String getRandomStr(String charset,String strLength)
    {
        RandomStrg rs = new RandomStrg();
        if(charset == null || "".equals(charset))
        {
            rs.setCharset("A-Z0-9");
        }else
            rs.setCharset(charset);
        if(charset == null || "".equals(strLength))
        {
            rs.setLength("4");
        }else
            rs.setLength(strLength);
        try{
            rs.generateRandomObject();
            return rs.getRandom();
        }catch(Exception e)
        {
            e.printStackTrace();
            return "8888";
        }
    }
    //得到点击数的随机数,大于100 小于500
    public static int getHits()
    {
        int hits = Integer.parseInt(getRandomStr("0-9","3"));
        if(hits > 500)
        {
            hits = hits - 500;
        }
        if(hits < 100)
        {
            hits = hits + 100;
        }
        return hits;
    }


    public static void main(String[] args)
    {
        for(int i=0;i<50;i++)
            System.out.println(getHits());
    }
}
